Loimia minuta Treadwell, 1929

Londoño-Mesa, Mario H. & Carrera-Parra, Luis F., 2005, Terebellidae (Polychaeta) from the Mexican Caribbean with description of four new species, Zootaxa 1057, pp. 1-44 : 21-22

publication ID

https://doi.org/ 10.5281/zenodo.170120

publication LSID




persistent identifier


treatment provided by


scientific name

Loimia minuta Treadwell, 1929


Loimia minuta Treadwell, 1929  

Figures 5 View FIGURE 5 H–N

Loimia minuta Treadwell, 1929: 10   –11; Figures 28–30.

Material examined: Mexican Caribbean: ECOSUR TERE­ 11 E 2 (1) Leeward of Contoy Island (21 ° 30 ’ 8.4 ’’N 86 ° 47 ’ 45.3 ’’W), Oct. 1983, by trawling. (1) Majahual (18 ° 40 ’09.6’’N 87 ° 43 ’01.4’’W), 22 Mar. 2000. (1) Paraíso, Cozumel Island (20 ° 56 ’ 38 ’’N 86 ° 59 ’ 35 ’’W), 5 Jun. 1995. (1) Leeward of Contoy Island (21 ° 30 ’ 8.4 ’’N 86 ° 47 ’ 45.3 ’’W), 3 Mar. 2001, 2 m.

Description: Specimen complete, mature female, with pale body on preserved material, with 105 segments, 62 mm long; thorax 13 mm long and 3 mm wide ( Figures 5 View FIGURE 5 H–I). Thorax well defined, as wide as anterior abdominal region. Abdomen paler than thorax, posterior body white, tapering to pygidium; coelom of abdominal segments with small eggs. Tentacles small and smooth. Tentacular membrane well developed. Eyespots absent. Upper lip with reduced spoon­like free edge; lower lip reduced, hidden by the first lateral lappet. Two pairs of lateral lappets on segments 1 and 3; first pair surrounding ventrally and laterally the tentacular membrane; second pair of lappet emerging laterally on segment 3 as a thin membrane, as long as first neuropodium, and as high as twice the anterior notopodia, not extending across the ventral side. Three pairs of branchiae, branched, starting from segment 2; first pair longer than the second, and the last the shorter; nevertheless, differences in size are not visible. Nephridial papillae indistinct. Ten ventral shields, starting from segment 2; divided in two (bisected) by transverse lines on midthorax, in three (trisected) on posterior shields. Ventral surface smooth, without midventral groove. Parapodia from segment 4, extending for 17 segments. Notochaetae of two types, long chaetae, thick, bilimbate capillaries ( Figure 5 View FIGURE 5 J), 6–7 per fascicule; and short chaetae smooth and thin capillaries ( Figure 5 View FIGURE 5 K), 7–8 per fascicle. Neuropodia from segment 5, uncini arranged in single row until segment 10, in double rows on segments 11–20, in back to back position, and in single rows from segment 21 until the pygidium; with uncini pectinate, thoracic uncini with five teeth ( Figure 5 View FIGURE 5 L), and the abdominal uncini with 6 teeth. Thoracic and abdominal uncini similar in shape and size, with short and narrow subrostrum, without subrostral process, with short anterior process directed downwards, basis strongly curved, with high and short posterior process, as a heel; posterior filament absent; long and curve occipitium, terminating in a capitium with 4–5 teeth. Pygidium with 6 long and digitate anal papillae ( Figure 5 View FIGURE 5 O).

Remarks: The total number of segments in all specimens complete revised varies from 102 to 105 segments. This species was synonymized with Loimia medusa   by Fauvel (1914) and Hartman (1956) because of the belief of the wide and cosmopolitan distribution in warm seas of the latter species. However, after the revision of type material, L. minuta   differs from L. medusa   by having notochaetae of two sizes, although they are both bilimbate, and by having ventral shields annulated (divided by two or three transversal lines) after the seventh shield. Specimens from the Mexican Caribbean belong to L. minuta   .

Distribution: Florida and Mexican Caribbean.














Loimia minuta Treadwell, 1929

Londoño-Mesa, Mario H. & Carrera-Parra, Luis F. 2005

Loimia minuta

Treadwell 1929: 10